A good nights' sleep will reward you with sharper cognitive functions in the morning - decision making, reasoning and memory. For the big race this translates into smarter running, knowing when to refuel and not getting lost.

So how do you go to sleep when you're all keyed up?

Have a light snack - 1/2 a turkey or peanut butter sandwich with a glass of warm milk, perhaps.

Get rid of all distractions. Keep your bedroom dark and quiet.

Shake out any lingering stress. Toss the day's pressure out the window.

Close your eyes and take deep, slow breaths. Visualize how perfect tomorrow will be.